Portion of a telephone exchanger



FIG. 1 is a front, top and right side perspective view of a portion of a telephone exchanger showing my new design,

FIG. 2 is a rear, bottom and left side perspective view thereof; and,

FIG. 3 is an enlarged view thereof showing a framed portion of the perspective view of FIG. 1 for clarity of illustration. 

The ornamental design for a portion of a telephone exchanger, as shown and described. 